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s <br /> Sequoia 885 Jarvis <br /> Morgan Hill,CA 95037037 <br /> Analytical cal {408}776-9600 <br /> J FAX(408)782-b308 <br /> www.sectuoialabs.corr <br /> IqIURS Corporation Project: ARCO#5450,Stockton,Ca MMC0716 <br /> 500 12th Street,Suite 100 Project Number: ARCO#5450,Stockton,CA Reported: <br /> Oakland CA,94607 Project Manager: Vern Elarth 04/07/03 14:05 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3C27006-EPA 5030B PIT <br /> Laboratory Control Sample Du (3C27006-BSDI) Prepared&Anal zed:03/27/03 <br /> Methyl tert-butyl ether 9.27 0.50 ug/1 10.0 92.7 63-137 4.33 13 <br /> Benzene 10.9 0.50 10.0 109 78-124 5.66 12 <br /> Toluene 9.18 0.50 10.0 91.8 78-129 7.57 10 <br /> Surrogate:1,2-Dichloroethane-d4 4.21 5.00 84.2 78-129 <br /> Laboratory Control Sample Du 3C27006-BSD2 Prepared&Analyzed:03/27/03 <br /> Methyl tert-butyl ether 7.59 0.50 ugll 9.04 84.0 63-137 8.58 13 <br /> Benzene 5.50 0.50 5.44 101 78-124 0.363 12 <br /> Toluene 26.8 0.50 32.8 81.7 78-129 1.13 10 <br /> Gasoline Range Organics(C6-C10) 375 50 440 85,2 70-113 0.532 9 <br /> rrogate: l,2-Dichloroethane-d4 4.07 5.00 81.4 78-129 <br /> Matrix Spike(3C27006-MS1) Source:MMC0566-02REPre ared&Analyzed:03/27/03 <br /> Methyl tert-butyl ether 224 10 ug/l 181 62 89.5 63-137 <br /> Benzene 108 10 109 ND 99.1 78-124 <br /> Toluene 519 10 656 2.6 78.7 78-129 <br /> Gasoline Range Organics(C6-C10) 8170 1000 8800 540 86.7 70-113 <br /> Surrogate:1,2-Dichloroethane-d4 4.38 5.00 87.6 78-129 <br /> Matrix 5 ike Du 3C27006-MSDI Source:MMC0566-02REPr ared&Analyzed:03/27/03 <br /> Methyl tert-butyl ether 214 t0 ug/l 181 62 84.0 63-137 4.57 13 <br /> Benzene 103 10 109 ND 94,5 78-124 4.74 12 <br /> Toluene 514 10 656 2.6 78,0 78-129 0.968 10 <br /> Gasoline Range Organics(C6-C10) 7540 1000 8800 540 79,5 70-113 8.02 9 <br /> Surrogate: l,2-Dichloroethane-d4 4.22 5.00 84.4 78-129 <br /> �equoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. Unless otherwise stated,results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> 6 of 7 <br />